From a4bf31470f7e2855f13d922e3e7ad1c7767d9afd Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Sun, 12 Oct 2025 16:28:53 -0700
Subject: add geometry shader

---
 3ner.cginc | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

(limited to '3ner.cginc')

diff --git a/3ner.cginc b/3ner.cginc
index 0536fb5..bac74ad 100644
--- a/3ner.cginc
+++ b/3ner.cginc
@@ -9,6 +9,7 @@
 #include "AutoLight.cginc"
 
 #include "brdf.cginc"
+#include "geometry.cginc"
 #include "pbr.cginc"
 #include "lighting.cginc"
 #include "globals.cginc"
@@ -50,6 +51,7 @@ v2f vert(appdata v) {
     return o;
 }
 
+//ifex _Tessellation_Enabled==0
 struct tess_factors {
   float edge[3] : SV_TessFactor;
   float inside : SV_InsideTessFactor;
@@ -170,6 +172,50 @@ v2f domain(
   UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
   return o;
 }
+//endex
+
+//ifex _Geometry_Shader_Enabled==0
+// maxvertexcount == the number of vertices we create
+[maxvertexcount(3)]
+void geom(triangle v2f tri_in[3],
+  uint pid: SV_PrimitiveID,
+  inout TriangleStream<v2f> tri_out)
+{
+  v2f v0 = tri_in[0];
+  v2f v1 = tri_in[1];
+  v2f v2 = tri_in[2];
+
+#if defined(_CENTER_OFFSET)
+  float3 n0 = v0.normal;
+  float3 n1 = v1.normal;
+  float3 n2 = v2.normal;
+#if defined(_CUSTOM31_FRAGMENT_NORMALS) || defined(_CUSTOM31_TESSELLATION)
+  float3 tmp;
+  deform_normal(v0.objPos_orig, n0, tmp);
+  deform_normal(v1.objPos_orig, n1, tmp);
+  deform_normal(v2.objPos_orig, n2, tmp);
+  // the average direction doesn't have to be precise, so don't bother with
+  // normalize().
+  float3 n = (n0 + n1 + n2) * 0.333f;
+#else
+  float3 n = (v0.normal + v1.normal + v2.normal) * 0.333f;
+#endif
+  float height = center_offset(v0.uv0);
+  v0.objPos += n * height;
+  v1.objPos += n * height;
+  v2.objPos += n * height;
+  propagateObjPos(v0);
+  propagateObjPos(v1);
+  propagateObjPos(v2);
+#endif
+
+  // Output transformed geometry.
+  tri_out.Append(v0);
+  tri_out.Append(v1);
+  tri_out.Append(v2);
+  tri_out.RestartStrip();
+}
+//endex
 
 float4 frag(v2f i, uint facing : SV_IsFrontFace
 #if defined(_CUSTOM31_TUBES)
-- 
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